DOWSIL SE 9157

Harmonization Code : 8473.30.80.00 | Parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 8470 to 8472 ; Parts and accessories of the machines of heading 8471 ; Other; Other

DOWSIL SE9157

Main features

  • 6-Minute Tack-Free Time
  • 5,675 cP Viscosity
  • 27 kV/mm Dielectric Strength

Product Description

DOWSIL SE 9157 Conformal Coating is a one-part, translucent, medium-viscosity silicone conformal coating for electronic assemblies. It cures at room temperature without added solvents and reaches a typical tack-free condition in 6 minutes at 25 deg C. A 5,675 cP viscosity supports syringe, brush, flow-coating, and spray application. After cure, the soft elastomer has a typical elongation of 180% and dielectric strength of 27 kV/mm. Applications include rigid and flexible circuit boards, connectors, sensors, and spot protection on components. Mild heat up to 60 deg C can accelerate cure for in-line processing.

Key features

  • 6-Minute Tack-Free Time: This surface-dry milestone is distinct from full cure.
  • 5675 cP Coating Viscosity: Typical as-supplied viscosity characterizes the medium-viscosity coating.
  • 180% Cured Elongation: Typical cured tensile strength is 90 psi.

Applications

Rigid and flexible circuit boards; connectors; sensors; spot protection on components.

Product Family

DOWSIL SE 9157

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Tack-Free Time
6 minutes
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
5675 mPa.s
General Properties
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
0.995
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
180 %
Electrical Properties
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material. Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property. As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
27 kV/mm
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
4.0 E15 Ohms⋅cm

Additional Information

Technical properties

As-supplied properties

PropertyValueUnitMethod / condition
Viscosity5,675cPTypical
Nonvolatile content96.9%Typical
Shelf life360daysAt 25 deg C; typical
Technical properties

Cured coating properties

PropertyValueUnitMethod / condition
Specific gravity0.995-Cured; typical
Tensile strength0.6MPaTypical
Elongation180%Typical
Dielectric strength27kV/mmJIS K 6249; typical
Volume resistivity4.0E15ohm*cmJIS K 6249; typical

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